Double glass cutter



Dec. 9, 1941.v

w.l ROBERTS ETAL DOUBLE GLASS GUTTER Filed March 20, 1939l INVENTORS.W41. TER Ros-Hrs BY HARRY /ofnrs MITORNEY. f

Patented Dec. 9, 1941 buiten 1 Claim.

This invention relates to a device for cutting glass and is moreparticularly designed to cut shatter-proof glass. The so-calledshatterproof glass consists of twosheets of glass cemented to a centralsheet of transparent flexible material such as nitro-cellulose orCellophane. In cutting a sheet of shatter-proof glass With a standardglass cutter, the cutting wheel is run along one side of the glass toout one sheet thereof, the pane is there turned over, and the wheel isrun along the other side to cut the other sheet. If the second cuttingline is not exactly over the first, an irregular broken edge willresult.

The principal object of this invention is to provide a glass cutterwhich will accurately and efficiently simultaneously cut both sheets ofa pane of shatter-proof glass at one operation with both cutting linesin accurate register with each other.

Other objects are: to provide a glass cutter in which the pressure ofthe cutting wheels against the glass will be uniform throughout theentire cutting operation; in which the pressure can be regulated fordifferent thicknesses of glass; and in which the wheels can be easilyand quickly mounted in and removed from the device.

Other objects and advantages reside in the detail construction of theinvention, which is designed for simplicity, economy, and efficiency.

These will become more apparent from the following description.

In the following detailed description of the invention reference is hadto the accompanying drawing which forms a part hereof. numerals refer tolike parts in all views of the drawing and throughout the description.

In the drawing:

Fig. 1 is a side View of the improved glass cutter.

Fig. 2 is a plan View thereof.

Fig. 3 is an enlarged longitudinal section through the cutter taken onthe line 3-3, Fig. l.

Fig. 4 is an enlarged fragmentary section taken on the line 4 4, Fig. 1.

Fig. 5 is an enlarged detail View of the wheel mounting mechanismemployed in this invention.

The improved glass cutter includes a frame consisting of an upper arm I0and a lower arm I I joined together at their one extremities by aconnecting portion I2 to form a complete, rigid, U- shaped frame. Thearms and connecting portion are preferably T-shaped in cross-section.The other extremity of the arm I0 carries a vertically Like positionedtubular portion I3. Extending from the upper end of the portion I3downwardly to the arm IIJ is a conveniently located handle portion I4.Below the handle I4, between the tubular portion I3 and the arm I0, aweb-like thumb and finger rest I5 is formed.

The free extremity of the arm II is provided with a rounded head I6which is positioned directly below the tubular portion I3. The roundhead I6 is provided with an upwardly extending boss I l. The boss is cutwith a groove I8 for receiving a glass cutting wheel I9. The wheel I9 ismounted in the groove I8 in a manner to be hereinafter described.

The tubular portion I3 has an enlarged upper extremity 2t which isinternally threaded to receive an externally threaded adjusting bushing2I. Through the bushing 2I and the tubular portion I3 passes a round,solid, wheel shaft 22 which is provided, between its extremities, with ashoulder 24. A compression spring 25 acts against the shoulder 24 andthe bushing 2I to constantly urge the wheel shaft downwardly in theportion I3. However, the wheel shaft 22 is prevented from passing allthe way through the bushing 2l and the portion I3 by an enlarged head 23formed on its upper extremity which rests against the bushing 2|. Thedownward movement of the shaft is thus limited, but the shaft can beforced upwardly until the spring 25 is completely compressed.

The lower extremity of the wheel shaft is bifurcated as shown lat 26.This bifurcation is directly above the groove I8 formed in the boss Il.In the end of the shaft, at right angles to the bifurcation 2&5, agroove 29 is formed. In the groove 29, at one side of the bifurcation26, is a perpendicular socket B.

The wheel 2'I revolves on an L-shaped member which is formed by bendinga stiff wire to form an axle 3| and stem 32 which is curved as shown inFig. 5. The wheel 2l is mounted in the bifurcation 29 by inserting thestem 32 into the perpendicular socket 39 and by placing the axle SI ofthe wire in the groove 29. Since the stem is curved, it is rmly wedgedin the socket 39 to securely hold the wheel in place.

The Wheel shaft is prevented from rotating in the member I3 by means ofa stopping pin 31 which passes through the bifurcation 26 and enters thesides of the porti-on I3.

The wheel I9 is mounted in the groove I8 in the boss I'I in the same wayas the wheel 2'I is mounted in the wheel shaft 22. The wheel I9 entersthe groove I8; an axle part of a second L-shaped member rests in agroove in the boss I'I which is at right angles to the groove I8; and astem part of the L-shaped member enters a perpendicular socket in theboss l1.

Since the groove I8 is in alignment with the bifurcation 26, the wheelsI9 and 21 are constantly held directly above each other so that when asheet of glass is run between the cutting wheels, it will be cut on bothsides with both cutting lines in accurate register with each other.

To aid an operator of the improved glass cutter to accurately follow apattern, a guide member 33 depends from the bottom of the head I6. Theguide member is notched as shown at 34, and is provided with a loop 35.The loop 35 surrounds a pin 3G which is secured at right angles to anotch 38 in the bottom of the head so that the apex of the notch is helddirectly below the glass cutting wheels I9 and 21.

While a specific form of the improvement has been described andillustrated herein, it is desired to be understood that the same may bevaried, within the scope of the appended claims, without departing fromthe spirit of the invention.

Having thus described the invention, what is claimed and desired securedby Letters Patent is: A glass cutting device comprising: an upper wheelsupporting member; a lower wheel supporting member; a U-shaped frameconnecting said wheel supporting members together, and holding them in aposition one above the other; means for supporting a glass cutting wheelin each of said supporting members; means for varying the distancebetween said wheels; and a guide member depending from said lowersupporting member immediately below the glass cutting wheel therein.

WALTER ROBERTS. HARRY ROBERTS.

